I have found it is roughly an order of magnitude cheaper to cook at home, even once you factor in the "lost" time.
The amount of time required to prepare incrementally larger batches increases at a sub-linear rate. The bigger your batch, the more food you get per unit of wall clock time. I try to prepare no less than 3 lbs of dry beans or 2 lbs of beef at a time. Anything less does actually feel like I'm wasting my energy.
The amount of time required to prepare incrementally larger batches increases at a sub-linear rate. The bigger your batch, the more food you get per unit of wall clock time. I try to prepare no less than 3 lbs of dry beans or 2 lbs of beef at a time. Anything less does actually feel like I'm wasting my energy.